Monitoring the properties of natural organic matter through UV spectroscopy: A consistent theory

Korshin, Gregory V.; Li, Chi-Wang; Benjamin, Mark M.

doi:10.1016/s0043-1354(97)00006-7

Cited by 481 publications

(289 citation statements)

References 23 publications

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“…Muller (1998) suggested that the concentration of organic matter could be measured as DOC or UV 254 . Similarly, Korshin et al (1997) reported that specific UV absorbance (SUVA), a ratio between UV absorbance capacity and DOC, was a good indicator of NOM in water. The SUVA was found correlated with CBPs formation by Barrett et al (2000) and Krasner et al (1989).…”

Section: Total and Dissolved Organic Carbonmentioning

confidence: 97%

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An investigation on parameters for modeling THMs formation

Chowdhury

Champagne²

2013

Global NEST Journal

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Reactions between natural organic matter (NOM) and chlorine during disinfecting drinking water form trihalomethanes (THMs) and other chlorinated by products (CBPs), some of which are possible carcinogen to human health. A number of models have been developed to predict THMs formation since the discovery of THMs in drinking waters. A fraction of these models used a total of 22 different parameters while individual models used 3 to 8 parameters. Some existing models incorporated more than one parameter from total organic carbon (TOC), dissolved organic carbon (DOC) and UV absorption capacity at 254 nm (UV 254 ), while all of these three characterize NOM in water; thus, there exist a possibility of illconditioned coefficient estimation. This paper presents the results of an experimental investigation on different parameters from four water supply systems in Newfoundland, Canada. Strong correlations were found among total organic carbon (TOC), dissolved organic carbon (DOC) and UV absorption capacity at 254 nm (UV 254 ). This study along with the past studies identified pH, temperature and reaction time as significant for THMs formation; however, some existing models ignored these parameters. Although these models have good performance in predicting THMs formation in respective environmental conditions, some models might suffer weakness from mathematical point of view; thus needs to be carefully applied. This study recommends using one parameter from TOC, DOC and UV 254 and chlorine dose, pH, temperature and reaction time for future modeling.

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Section: Total and Dissolved Organic Carbonmentioning

confidence: 97%

“…The NOM can be expressed in terms of surrogate measures, such as TOC, DOC or UV 254 (Sung et al, 2000;White et al, 2003;Muller, 1998). Increase in NOM increases THMs formation (Korshin et al, 1997). Figure 1 (iiv) shows the correlation between NOM and THMs formation for the four water sources in Newfoundland.…”

Section: Natural Organic Matter (Nom)mentioning

confidence: 99%

An investigation on parameters for modeling THMs formation

Chowdhury

Champagne²

2013

Global NEST Journal

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“…Recent work by Del Vecchio and Blough (2002Blough ( , 2004 has elucidated the probable chemistry behind the light absorption of HS, i.e., the chemistry behind CDOM absorption. They proposed a model of donor-acceptor charge transfer that produces a featureless spectrum and is much more widely applicable across systems than models of superposition of multiple chromophores (Korshin et al 1997;Goldstone et al 2004). Thus, the spectral feature of CDOM must be summarized and studied to adequately address the reactivity of CDOM.…”

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confidence: 99%

Increases in the longwave photobleaching of chromophoric dissolved organic matter in coastal waters

2009

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Salinity effects on the photobleaching of chromophoric dissolved organic matter (CDOM) due to coastal mixing were investigated through a comparative study of surrogate and surface-water CDOM. Suwannee River humic acid (SRHA) and ultrafiltered river dissolved organic matter (UDOM) added to mixtures of river and seawater permeates (,1 kDa) that varied in salinity from 0 to 33 to mimic coastal mixing. Surface-water CDOM was collected from the Chesapeake Bay in January, June, and September 2002. Shortwave CDOM absorption loss (e.g., 280 nm) did not change with salinity; however, longwave CDOM absorption loss (e.g., 440 nm) often decreased by 10% to 40% with salinity. Apparent quantum yields for average absorption loss from 280 to 550 nm (Q avg ) increased with salinity for both surrogate and surface-water CDOM, providing evidence for an effect of salinity independent of light absorption among different samples. Further, hydrogen peroxide photoproduction from UDOM increased from 15 to 368 nmol L 21 h 21 with salinity, even though pH values were circumneutral. A kinetic model demonstrated that, at circumneutral pH and iron concentrations expected for the Chesapeake Bay, photo-Fenton chemistry could not explain the increase in hydrogen peroxide production quantum yields (Q hp ) with salinity. Using Q avg for the SRHA and UDOM surrogates, a model of the change in surface-water CDOM photoreactivity in the Chesapeake Bay as a function of salinity suggested additional CDOM inputs for the lower Chesapeake Bay. Because estuarine mixing increases photobleaching of longwave CDOM absorption, the modeling of absorption coefficients above 400 nm may underestimate dissolved organic matter in coastal waters.

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“…A absorção de radiação visível e de ultravioleta de maior comprimento de onda é restrita a um número limitado de grupos funcionais (chamados cromóforos), que contêm elétrons na camada mais externa com energias de excitação relativamente baixas (Skoog;Holler;Nieman, 2002 (Baes;Bloom, 1990;Korshin et al, 1997).…”

Section: Espectroscopia De Absorção De Radiação No Ultravioleta-visívelunclassified

Estudo da matéria orgânica e composição elementar de solos arenosos de regiões próximas a São Gabriel da Cachoeira no Amazonas

Santos¹

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Monitoring the properties of natural organic matter through UV spectroscopy: A consistent theory

Cited by 481 publications

References 23 publications

An investigation on parameters for modeling THMs formation

An investigation on parameters for modeling THMs formation

Increases in the longwave photobleaching of chromophoric dissolved organic matter in coastal waters

Estudo da matéria orgânica e composição elementar de solos arenosos de regiões próximas a São Gabriel da Cachoeira no Amazonas

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